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Effects of fertilisation on rhizospheric and heterotrophic soil CO2 efflux in boreal Norway spruce stands

Olsson, Per (2006). Effects of fertilisation on rhizospheric and heterotrophic soil CO2 efflux in boreal Norway spruce stands. Umeå : Sveriges lantbruksuniv. , Stencilserie / Sveriges lantbruksuniversitet, Skogsvetenskapliga fakulteten, Institutionen för skogsekologi, 1104-1870 ; 113
[Licentiate thesis]

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There are strong indications that the global mean temperature is rising. The increase in temperature is mainly attributed to the increase in the atmospheric CO2 concentration, [CO2], the result of anthropogenic emissions from burning fossil fuels and changes in land-use, mainly deforestation. The total emissions of CO2 cannot be accounted for by the measured increase in [CO2], nor by the amounts estimated to be taken up by oceans and terrestrial ecosystems, hence there is a missing sink for CO2, where the boreal forest may play an important role. The tree growth in boreal forests is limited by climate and nutrients, hence could a warmer climate, and more available nutrients, increase production. Increased temperature may, however, also accelerate decomposition of soil organic matter. Since production and decomposition is affected by the availability of nutrients, increased N-deposition or forest fertilisation may mitigate the effects of global warming. The main objective of the present study was to determine the effects of nutrient supply on soil respiratory components in a boreal Norway spruce forest, especially the effects on heterotrophic and rhizospheric activity. To partition soil respiration into these components, tree-girdling, which terminates the carbohydrate supply from photosynthesis to the rhizospheric component, was used. The study was conducted in 40-year-old Norway spruce stands in Northern Sweden, which were growing at growth-limiting and optimised availability of soil nutrients, respectively. During the period of annual maxima of soil respiration, fertilisation decreased rhizospheric soil CO2 efflux by approximately 50%. Also heterotrophic soilCO2 efflux was approximately 40% lower in fertilised plots, than in non-fertilised plots, despite a three-fold higher above-groundproduction in thefertilised plots. In conclusion forest fertilisation contributes to C sequestration by increasing biomass production as well as retarding decomposition of soil organic matter.

Authors/Creators:Olsson, Per
Title:Effects of fertilisation on rhizospheric and heterotrophic soil CO2 efflux in boreal Norway spruce stands
Series Name/Journal:Stencilserie / Sveriges lantbruksuniversitet, Skogsvetenskapliga fakulteten, Institutionen för skogsekologi
Year of publishing :January 2006
Number of Pages:29
ALLI. Olsson, P., Linder, S., Giesler, R. & Högberg, P. 2005. Fertilization of boreal forest reduces both autotrophic and heterotrophic soil respiration. Global Change Biology 11, 1745–1753. II. Högberg, P., Nordgren, A., Ottosson-Löfvenius, M., Bhupinderpal-Singh, Olsson, P. & Linder, S. 2005 Fractional contributions by autotrophic and heterotrophic respiration to soil-surface CO2 efflux in Boreal forests. In: The Carbon Balance of Forest Biomes. (Eds. H. Griffiths & P.G Jarvis), Francis & Taylor, pp. 249-265.
Place of Publication:Umeå
ISBN for printed version:SLU-SEKOL-STL-113-SE
Publication Type:Licentiate thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F04 Fertilizing
P Natural resources > P34 Soil biology
Subjects:Not in use, please see Agris categories
Agrovoc terms:picea abies, forest soils, carbon dioxide enrichment, storage, soil respiration, carbon cycle, nutrients, fertilizer application, girdling, boreal forests, sweden
Keywords:autotrophic respiration, girdling, Picea abies, soil respiration, soil organic matter, starch
Permanent URL:
ID Code:1020
Department:(S) > Institutionen för skogsekologi (930701-061231)
Deposited By: Per Olsson
Deposited On:11 Jan 2006 00:00
Metadata Last Modified:02 Dec 2014 10:09

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